Personally, I could see a minor fee being charged for the right to publish custom maps, say, 5 to 10 USD. Nothing of any real note, but enough to dissuade anyone from just uploading crap over and over. As it stands, we all effectively pay 40 to 60 USD for publishing rights in SC2. As a one time fee, it should be of little consequence to anyone who is halfway serious about this kind of thing.
or let ppl with sc2 account upload maps only :D
no editor -> no arcade? then we really are screwed, a shared arcade is all i hoped for